Elevator system



May l5, 1945.

WITNESSES:

E. M. BOUTON ET Al.

ELEVATOR 'SYSTEM Filed July 4, w42

9 Sheets-Sheet l 5 INVENTORS 30 fai/y/M 50u75 and @an/70 5b/Www'.

f AT RNEY May 15, 1945. E. M. BOUTON ET AL 2,376,113

ELEVATOR SYSTEM Filed July 4, `1942 9 Sheets-Sheet 2 May 15, 1945. rE..M. OUTQN `|51 AL 2,376,113

ELEVATOR SYSTEM W Filed July 4, i942 9 sheets-sheet 4` wwwA i; M. BOUTONET AL 2,376,113

May l5, 1945.

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E. M. BOUTON ET AL ELEVATOR SYSTEM `Filed July 4; 194,2y

9 svhetS-sheet esI RWM.

/\ AZORNEY @Mx y ff@ May l5, 1945.

Filed July 4, 1942 Q-'CI-CI I I I I I I I I I4 I I I I I I I I I I I I I.I I gf WITNESSES:

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` 9 sheets-sheet 7 "Q: hy

INVENTORS May 15, 1945. E. M. BoUToN ETAL 2,376,113

ELEVATOR SYSTEM wlTNEssEs; Y

INVENTORS Patented May l 1945 estan?.

2,376,113 ntnvsra SYSTEM Edgar M. Bouton, Nutley, and Danilo Santini,Tenafiy, N. J., assignors, by mesne assignments, to WestinghouseElectric & Manufacturing Company, East Pittsburgh, Pa., u corporation ofPennsylvania Application' .my 4, 194s, serial No. Mavic is claims. toi.isteer Our invention relates to systems of control for electricelevators and more particularly to such systems as include a number ofelevator cars, operating together as a bank, and are controlled bypassenger-operated push buttons located\at the various floor landincs.

Although notv limited thereto, our invention is service available foroilice buildings and other tall structureshaving a large number offloors and a relatively large volume of passenger traino.

In such systems, in the absence of special control provisions whlch willbe described, there is a tendency' for the varlouscars to distribute thebuilding tramo unevenly, and, inthe Vtaller buildings, for the carstobecome hunched and thus prevent reasonable uniformity them.

These systems also tend to provide better service at certain floors thanat others, particularly dur. ing the noon and evening rush periods, atwhich times a relatively large number of calls are registered atpractically all lioors of the building within a relatively short periodof time. At such rush periods, each car is lled to capacity by arelatively few stops, perhaps three or four. Considering a car leavingthe upper terminals. sucha car is usually required to make these fewstops at the upper floors and so passes the lower floors of spacingbetweenv @ur system will provide normal service to the entire buildingasflong as the demands on the system are normal. in this normal serviceeach car runs to the highest call before reversing. in

5 the evening when the building is sensaciones,

without stopping. Because of the frequency with which calls areregistered, the next car of thel series is also filled to capacity bythree or four stops at upper oors and so passes the lower oors A Ysystem is divided into an upper zone of a. selected without stopping.yIn the operation of these systems, therefore, the response to callsregistered from lower floors of the building is delayed until most ofthe trafllc from the upper floors has received attention.

In order to provide more uniformv service throughout the building-during heavy traine Y peaks, we have devised a. selective system foroperatlng the elevators in which a carmay be re.;l

versed automatically in any part of its shaft travel if conditions existwhich -require its reversal for the best service. An up traveling carmors when the number 0f causinthe IQWel OQI'S" with passengers shouldnot be reversed until the lpassengers vhave been discharged. and a carservlce in some other suirer this highest call will usually be a downfloor call.

fis the demand for service becomes heavier, the upper oors of thebuilding will tend to monopolize it and the lower floors will notreceive sumcient service.` When this condition occurs, the number fcalls registered at the lower oors will increase. When these havereached a Il :reclctcrn mined number, one of the cars will reverse atthe highest down call occurring in a lower sono which comprises aselected number of the lower floors of the building, and it will servethese lower floors at the expense of the service at the upper floors. Bya. proper choice oi division between upper and lower doors and byrequiring certain of the cars to travel to the highest down call oi theupper floors by making it incapable of lower zone reversaha balance canbe obtained where all floors will receive substantially equal service.

it is, therefore, an object of our invention to provide a. novelelevator system for equaliaing the service rendered to the oors,particularly during a period of high service demand.

A further obj ect is to prowde means for rendering service to the lowerportion of the lioors A.

Y totheupper terminal but will under certain concitrons" operate toanswer only down` calls at lower floors, without being limited to aparticular number or lower flooraregardless of the fact that the numberof upper moors and a low zone of a selected number of lower noors. Znother words,

it is' an object to divide the system into an upper group of floors anda lower group of ooxs and toalso divide the carsinto two groups, one.group answering calls throughout the system and the other groupnormally answering only calls in the o lower group oi oors but goingabove the lower taken in conjunction lqulrc practically its fullcapacity. Otherwise the portion of the building may with theaccompanying drawings, of which: 'Y

Figure l is a diagrammatic representation of aul elevator systemembodying ou'r invention;

GDR

- son.

2 savana Fig. 2 is a diagrammatic representation ofthe stationarycontact segments and the moving brushes on a floor selector for one ofthe elevator cars embodied in Eig. 1, with Vthe brushes disposed in theposition they take when the car is stopped at the third Boor;

Figs. 3, 4, 5 and 6 collectively constitute a diagrammaticrepresentation in straight-line style of the circuit connections fdr thetwo-car elevator system illustrated in Fig. 1. VThe iigures should beassembled vertically in numerical order with Fig. :i at the top.

Figs. 3A to 6A, inclusive, are key representations of the relays inFigs. 3 to 8, inclusive, illustrating the coils and contact membersdisposed in horizontal alignmentn with their positions in thestraight-line circuits of Figs. 3 to 6. Figs. 3A to 6A should be placedbeside the corresponding Figs. 3 to 6 to facilitate the location et thevarious coils and contacts.

The elevator system illustrated is provided with two cars i and B forserving seven floors. This number oi cars and this number of iloors havebeen selected for the purpose of simplifying the disclosure as much aspossible. but it is to be understood that the invention may be used forany reasonable number ofcars in a bank servinl any reasonable number offloors. vFlor example, the invention would be suitable for aninstallation of six cars serving thirty floors. A

For the sake of simplicity, the apparatus individual to each car will begiven the same reference characters except that the apparatus for car Bwill be giyen the preilx ZB to indicate that it is for car B instead offor car A.

Apparatus individual to car A D-down switch E-slow-down inductor relayF-stopping inductor relay G-inductor holding relay Apparatus common toboth cars l Down call-storing relays, common to all the :suturesillustrated and described in uns up- 7s Up call-storing relayacommon toall cars plication are illustrated and described in the copendingapplication of H. W. Williams, D. Santini and M. L. Mount, Serial No.450,110, filed July 8,

1942, and assigned to the Westinghouse Electric. 5 Elevator Company.

Apparatus in Fig. 1 of the drawings Referring more part cularly to Fig.1 of the drawings, it will be ob erved that car A is arranged to besupported in a hatchway by a cable 'I0 which passes over a sheave Il toa counterweight I2. The sheave I I is mounted for rotation by a shaft I3driven by a gnotor I4. A brake I5 of the usual spring-operated,electro-magnetically-released type is provided for stopping furtherrotation oi' the sheave Ill'when the motor Il is als on which thecarriage is mounted The csr- 25 riage IIis provided with a number oibrushes which are disposed, upon movement of the car,

to successively engage stationary contacts arranged in rows on theselector in position to cor- 1 respond to the floors of thebuilding. Forsim-- plieity, only two brushesy 32 and 42, and two rows of contactsegments, b2 and a2.' etc., disposed to be engaged by them areillustrated in Fig. l, but it will be understood that in the system tobe described herein, as well as in practice, a much larger number ofbrushes and rows of contact segments is required. Other forms ofselectors may be substituted for the selector shown, if desired.

A starting switch Cs is mounted in the csr to be operated by atheattendant to start the cur. when the car switch is rotated unuciockwise,it closesits contacts CSI to start the car for the direction i'o'r whichit is conditioned tooperate. Whenu the car switch is centered, it leavesthe control system of the ear in such condition that the car can bestopped by operation of hall buttons at the eiloor landings or stopbuttons in the car. It is to be understood that the car may be operatedby the car s'witch or that any suitable control means may be sub#stituted for the car switch. The illustration ci suplicity in describ-.ing the system.

the car switch is used `i'or The car buttons 2c, etc. (one for eachfloor) are mounted in the car, so that the attendant may, by operatingthem, cause the car to atop automatically at any floor.` The directionof operation of the carI is controlledby relays W and X as will bedescribed in connection with Fig. 3.

The hall buttons are mounted at the iloor landings, in order thatwaiting passengers may cause the cars to stop thereat. An up button anda down button are'provided at each floor intermediate the terminals. `Adown button is disposed at the top terminal `sind an up button at thebottom terminal.' 1 illustrates only the .up hall. call button 2U andthe down hall call 2Dfor the second door.

' In order to automatically effect accurate stopping of carA atv thenoors iny response to operation of the stopping buttons 2c, etc., in thecar, or by operation of the hall call buttons 2U, 2D, etc., at thefloors, a slow-down inductor relay E and a stopping inductor relay F areagraire mounted on the car in position to cooperate with suitableinductor plates of iron or other magnetic material, mounted in thehatchway adjacent to cach floor. Only the up plates UEP and UFP and thedown plates DEP and DFP for the second floor are illustrated.. Similarplates are provided for each.floor, except that the top terminal hasonly up plates and the bottom terminal only down plates/ The inductorrelays E and F, when their coils are energized, have normally incompletemagnetic circuits which are successively completed by the inductorplates as the car approaches a floor at which a stop is to be made.These relays are so designed that energization of their operating coilswill not produce operation of their contacts until the relay is broughtopposite its inductor plate, thereby completing the relay magneticcircuit. Upon operation of the relay contacts (such as El or E2) theyremain in operated condition until the relay operating coil iscleeriergized,7 even though the inductor relay moves away from theposition opposite the inductor plate which completed its magneticcircuit. The plates should he so spaced in the' hatchway as to providedesirable distances for slowdown and stopping of the cars at the doors.@ther methods of controlling slowing vdown and stopping of the car maybe used if so desired.

lin the present system, which is given as an example of how theinvention may be utilized, the various control circuits are so connectedin accordance with our invention with a plurality of zone circuits thatthe system will operate with a low zone or lower group of floorsincludlng the Aflrst, second, third and fourth oors a low zone car whichwill not normally go to the upper terminal; that is, it will answer onlydown calls in the low zone when they exceed a predetermined number butwill go above that zone to answer?. down call or down calls when thedown calls in the low zone do not exceed that predetermined number. Thusthe cars may be divided into two groups as desired so and a high zone orhigh group oi. floors including the fifth, sixth and seventh floors.lFloor one may be considered as the parking door. The division betweenthe two zones of floors is determined by making certain wiringconnections with the zone circuits as described later herein inconnection with Fig. 5.

The cars and their control apparatus are provided for operation, undernormal conditions, as a high call reversal system in which the cars stopfor up ycalls on their up trips but autoA4 matically stop and reverse atthe highest down call when there is no service required above thathighest down call. If the car attendant desires, for any reason, to goabove the highest down call while on an up trip he can do so by pressinga car call button, 6c, etc., for a floor above to cause the car to keep-on up to such However, at certain peak periods in down travel thesystem is adjusted or set to cause selected cars to serve down calls in.the lower ioors when they exceed a predetermined number.

In accordance with our invention, each car has a double throw zoningswitch (I9 in car A) by means of which it may be conditioned foroperation as a low zone car or for operationvas ahigh zone car. Y 4

When switch I9 is in its high-zone car position, its contacts i9a (Fig.4) in the up stopping that the cars selected for the high zone groupwill run to the highest floor lcall of the upper zone before reversingand may stop for down Vdoor calls in the lower zone on down trips andthe cars selected for the low zone group may go to the upper zone butwill not go to the upper zone andV will answer only down calls, in thelower zone, when the conditions reduire this response. bviously, lowzone cars do not take on up passengers at the lower terminal and do notanswer up calls and up Ypassengers. must wait for high zone orthrough-trip cars.

A push-button switch 2 is provided in car Y' to permit the attendant toVby-pass the calls ahead of his car when it is loaded or whenever theattendant desires to operate the car straight through. `When. switch 21is pressed to 'by-pass calls, it opens its contacts 210, (Fig. 4;) toprevent the car answering calls.

Apparatus in Fig. 2

Fig. 2 illustrates an enlarged view of the lfloor selector it of Fig. i.vln this figure, the various stationary contact segments are representedby rectangles and the contacting brushes by small circles. Thel brushcarriage il is shown by dotted lines in the position it occupies whenthe associated car is stopped at the third floor.

The contact segments a2 to al' on the fioor selector are disposed to besuccessively engaged by the brush 30 to control the high car call relayH and by the brush 3l for completing stop circuits set up by the callpush-.buttons in the car for up direction stops. The lbrush 30 should belong enough to bridge adjacent contact segments. A

The down cancel contact segments f2, etc., and

brush 4|, the down floor call contact segments g2, etc., and brush 42,and the down car call contact segments h2, etc., and brush 43 areprovided ior connecting circuits for the down direction in the samemanner es described for thel up direction.

circuit are closed so that the car will answer up y callsganditscontacts Ib (Fig. 6) are open to prevent operation of its limitingrelay Z and its quota-adjusting relay Y. When switch I9 vis in itslow-zone car position, its contacts Ilia arev open to prevent the carfrom answering up floor calls and its contacts l9b are closed to permitoperation of the relays Z and Y to make the car On the right-hand sideof the floor selecto fa series of switches 52.130 56 are illustrated asdisrposed to be operated by a cam 9 on the carriage il as it moves fromits floor to floor, position, for the purpose of controlling a high carcall circuit.

Apparatus in Fig. 3

Referring particularly to'Fig'. 3 of the drawings, it will be observedthat control circuits are shown on the left-hand side which areindividual to car A. At Athe right-hand side, the circuits shown areindividual to car B.

As shown, the motor 'I4 is provided with an armature MA which ismechanically Vconnected The ,up contact segments di' to the shaft I3 fordriving the sheave il. The brake I is provided with a winding 2l) whichis energized on energlzation of the motor il. The m tor I4 includes theusual shunt-type main fie d winding HF, which is connected forenergization across the supply conductors L-i and L+2. 'I'he armature HAis connected for energization by a loop circuit 22 to a generator Gwhich is provided with an armature GA.

In order to control the direction and magnitude of the voltage generatedby the generator armature GA, a separately-excited main. field windingGF is provided for the generator G. A ileld resistor RI is included inthe ycircuit of the ileldwinding GF to provide speed control for themotor Il. The generator G is provided with suitable means such as aseries field winding GS for correcting' the speed regulation of motorI4.

The master switch CS located in car A is switch il and a down reversingswitch D. The

reversing switches U and D are provided with contact members forconnecting the generator field winding GF to the conductors L-l andL-l-l in accordance with the direction in which it is desired to operatethe car. When either the up or the down reversing switch U or D isenergized, the car running relay M is also energized to conditioncertain circuits for operation. The common circuit of the reversingswitches U and D and the running relay M includes the usual safetydevices indicated diagrammatically at 23.

A high-speed relay V is provided for short-circuiting the resistor RIdisposed in series circuit relation with the generator field winding GFfor applying the maximum voltage to that winding when the car isoperating at normal high speed. 'I'his relay is controlled by theswitches U and D on starting and by the slowdown inductor relay E whenstopping.

An upper and a lower mechanical limit switch VTU and V'I'D, are providedfor interrupting the circuit of the high-speed relay V when the carreaches a proper slow-down :point in advancev of the upper and lowerterminals, respectively, and an upper and a lower stopping limit switchSTU and STD, are provided for opening the vcircuits of the reversingswitches U and Dat the terminal limits, in accordance with the usualpractice.

An up direction preference relay W and a down directionpreference relayX are provided for controlling the direction of operation of the car andperforrnirg certain functions inconnection therewith.v The operatingwindings of these relays are controlled by a top limit switch 30T', abottom limit switch 30B and the highcall reversal relays. Each of thelimit switches 30T and MB is arranged to be opened when car 'A arrives'at the corresponding terminal, thereby interrupting Athe circuit of thedirection preference relay W or X corresponding to the direction ofoperation of the car. Also when the high cali reversal relays operatewhile theA car isbetween terminals, the relays W and X.

are operated to reverse the direction switches. Hence the car attendantdoes not need to do anything except close or open the car switch CS andoperate the car call buttons.

The energizing coils for the slowdown nductor switch E and the stoppinginductor switch F, are

illustrated in this gure as arranged to be energized on operation of thecontacts Si of a hall call stopping relay S, the contacts Ti oi a carbutton relay T or the contacts J oi' a high call reversing relay J. (Theoperating coils for relays S and T are illustrated in Fig. 4 and thecoil 5 for relay J is illustrated in Fig. 6 and will be described inconnection therewith.)

An inductor holding relay G is provided for maintaining the inductorrelays in energized condition during a accelerating or stoppingoperation.

A door relay DR is illustrated as controlled by a plurality of doorsafety contacts. The relay DR may be used for various safety circuits,and it is also used for assisting in the control oi' the high callreversing relay J shown in Fig. 6.

Apparatus in Fig. 4

The car buttons 2c, etc., described in connection with Fig. 1, areillustrated with their holding coils 2cc, etc., and circuits in theupper part of Fig. 4, in connection with the high car call relay H andthe stopping relay T. The coils Zcc, etc., are energized when the carstarts in either direction to hold in the car buttons 2c, 3c, etc.. asthey are operated, until the direction of the car is reversed, so thatthe temporary operation of a car button by the attendant will cause ittoremain in operated condition until 'the car is reversed.

The high car call relay H is used to prevent relay J (Fig. 6) fromreversing the car at the highest registered floor call when a stop callfor a floor above is registered on the stop buttons in the car. It isconnected by brush 30 to the row of contact segments a2, etc., on thefloor selector I6, so that it will be energized whenever a stop call isregistered on one of the stop buttons in car A for a floor above thecar. The switches -52to 56, inclusive, operated by the cam 49, are shownas disposed in the circuits of the car buttons to prevent energizationof the relay H by operated stop buttons in car A for floors below thatcar.

The car stopping relay T is connected to the up brush 3l engaging therow of contact segments a2, etc., and to the down brush 43 engaging therow of contact segments h2, etc.; so that, when a call is registered ona car button .and the car approaches the energized contact segmentcorresponding thereto, relay T will be energized to stop the car byenergizing the inductor relays F and E.

The oor buttons 2U, 2D, etc., `described in connection with Fig. 1 areshown with their circuits in the lower part of Fig. 4. Associated'witheach floor button is a call registering or storing relay by means ofwinch the momentary pressing of the button will set up or register astop call which will hold itself until it is answered by the stopping ofa .car 4 at that floor for the direction of the registered call. Thecall registering relays are designated as 2DR to TDR. for the downdirection andas ZUR, SUR and SUR for the up direction. For simplicity,the up di` rection registering relays and iloor buttons for only thesecond. third and sixth doors are shown, as the up buttons andregistering relays for the other floors will be readily understood.

The down call registering relays, when enerments g2, etc., and the upregistering "relays, when energized, close circuits to the row ofcontact sul ments b2, etc., on the floor selector so that the contactsegment for a floor for which a cali is 7s registered is'energized aslong as the call exists. v

gized, close circuits to the row of contact olv accents A car stoppingrelay S is shown as connected to the up brush 32 engaging segments b2,etc., and the down brush 42 engaging segment g2,- etc. When the carapproaches a iioor in a direction for which a call is registered, thecorresponding brush engages the energized contact segment for that floorand that direction and thereby causes the relay S to be energized,which, in turn, energizes the inductor relays F and E of that car toeiect the stopping of that car at that iloor.

A cancellationY coil is wound in opposition to each call registeringcoil and connected to the cancellation contact segments on the iloorselector, The up cancellation coils are designated las 2URN, etc.,connected to the up segments c2, etc., and the down cancellation coilsas ZDRN, etc., connected to the down segments f2, etc. As the brush 33moves over the segments c2, etc., and the brush 4l moves over thesegments j?, etc., they energize the cancellation coil for any ,iloor atwhich the car stops to answer a stop call.

Apparatus in Fig. s

Fig. 5 embgdies the high floor @au relay K and the transfer relay TRtogether with the operating circuits therefor.

The high floor call relay K of car A is provided for controlling theoperation ofthe high call reversing relay J for that car shown in Fig.6, in accordance with the existence or non-existence of registered floorcalls above it.. In order to get a reversal of a car at a call, it isnecessary to energize its relay K. This relay is connected' to thesupply conductor LT1-5, through either the normal call indicator circuit50 for the high zone or throughthe low zone circuit conductor 5l,depending upon whether relay TR is energized or deenergized. Thecircuits 50 and 5l are common to all the cars.

The circuit 50 includes back contacts of the up andthe down callregistering relays arranged in series relation according to the naturalse quence of the floors and it 'is connected at floor points with thecontact segments dl, d2, etc. through back contacts of .the transferrelay TR. Consequently, when the relay TR. is deenergized and car A istraveling on circuit 50, the relay K for car A will not be energized aslong as a call exists at any iloor above `the floor of the contactsegment on which the brush 34 rests, but as soon as the brush reaches asegment with no stored calls above it, a circuit for the relay iscompleted and it is energizedf- A i l The circuit 5l includes backcontacts of only the down call registering relays for the floorsincluded in the lower z one and they are arranged in series according tothe natural sequence of the iioors and the circuit is connected at iioorpoints with the contact segments dl, d2, etc., through the frontcontacts of the relay TR. Therefore,

when the quota relay Q and consequently the relay TR are energized, therelay K will not be energized as long as a down call exists at a floorin the low zone above the car but asson as the car reaches the uppermostregistered down call in thelow zone, its relay K will be energized toeffect its reversal.

The circuit 5l and the contacts therein provide means for dividing theiioors into zones. The number of iioors included in the low zone isdetermi-ned by the number of lower floors having their hall callregistering relay contacts included in the low zone circuit 5l. The highzone includes the floors above the low zone. If it is desired to includemore floors, in the low zone,

of five floors, this can be effected simply by isn--v cluding backcontacts of the down cali registering device BDR for the fifth iloor inthe low zone circuit 5I in a manner similar to the contacts 4DR2,connecting the contact segment d5 and Bd tothe circuit 5I through frontcontacts of the transfer relays TR and BTR, and connecting a contactsegment e5 in Figli to the circuit 2i, so that the low zone cars willreverse in response .to a predetermined number of down hall calls in thelower rive iloors instead of the lower tour floors.

When a low zone car leaves the lower terminal on a trip, it starts up onthe normal call indicator circuit 5l). However, if a sumcient number ofdown calls are registered in the low zone to operate the quota devicewhile a low zone car is running up therein, that device causes operationof the transfer relay 'IR ofthat car which, in turn, transfers that carfrom the normal circuit 5l) to the low zone circuit lil, so that thatlow zone car will stop, at the highest down call in the low zone, or ata higher licor in the low zone, depending upon the position of thecar inthe low zone, at the time the quota is filled.

The transfer relay .TR is provided for transferring the relay Kfromcontrol by the normal circuit 5() to control by the low zone circuit5l when the car is a low zone car, the quota relay has been energized,and the car is moving upwardly Apparatus "in Fig. 6

Fig. 6 illustrates the circuits for the high call reversing relay J, thelimiting relay Z, and the quota-adjusting relay 'Y for each of the cars,together with the quota relay Q which is common to all the cars.

The high call reversing relay J is provided A'for so preparing thecircuits of car A that it will reverse its direction of operation at thefloor corresponding to the highest registered down call in the high zonewhen it is a-high zone car and in the low zone when it is alow zone car.It stops the car by closing its contacts J I in the circuit of theinducto'r relays E and F (Fig. 3) and it then reverses the stopped carby opening its contacts J2 in the circuit of the up direction preferencerelay W (Fig. 3). K

The quota relay Q is provided -for totalizing the down calls in the lowzone. It is common to all the cars and its energized operation iseiected by a predetermined number of low zone down calls being inexistence and a low zone car moving up in the low zone.

The energization of the quota relay is controlled by a plurality ofbranch circuits, each of which-includes a quota resistor, such as R2,and which are controlled by contacts operated by the dQwn floor callrelays, such as 4DR, in the 10W zone, and by contacts operated by thelow zone relay and the quota-adjusting relay Y. The quota relay and theresistors together with their connections are so designed that the relaywill be responsive to a predetermined quota of registered down calls inthe low zone.

For example, if car A is conditioned as a lowv zone car and is going up,its relay Z will bev energized when the car leaves the rst floor toclose its contacts in the circuit for the quota relay Q. As long as nodown call is registered in the low zone, the relay Q will not beenergized. If only one down call in the low zone is registered, relay Qwill still remain unoperated because sufficient current will not flowthrough the o e resistor'v to actuate relay Q. As soon as two own callsin the low zone are registered, suilicient current Will flow through thetwo resistors in parallel to actuate relay Q. The resistors and re(-`ylay Q are normally so designed that at least two down calls in the lowzone must exist before the relay will operate.

The limiting relay Z is provided to limit the oors at which a reversalcan be made by a low zone car in response to operation of the quotarelay Q, so that a low zone car can have its transfer relay operatedonly while itis moving up past oors in the low zone for which contactsegments e are connected to thecircuit 2l. The relay Z is arranged foroperation by the brush Ill engaging the contact lsegments e described inconnection with Fig. 2.

As the fourth floor is, for the sake of simplicity in circuits, chosenas the top floor of the low zone in this illustration and description ofthe invention, it will be understood that it is difficult tosatisfactorily illustrate the operation of segments e and the relay Zbut it is believed that we have given suillcient information to enableany one skilled in the elevator art to easily construct and install asatisfactory control circuit embodying these features.

The quota-adjusting relay Y is Aprovided for energizing the transferrelay TR upon operation of the quota relay Q and for so controlling thecircuit of the relay Q as to deenergize that relay when car A is giventhe quota of down iloor calls registered in the low zone. The relayY isprepared for action only when thecar is conditioned for operation as alow zone car by the closing of contacts |917 and after that it isenergizd when the quota relay is energized. When energized, relay Ycloses its self-holding circuit and remains energized until car AAreverses. A switch 26 operable byV aA cam when the car arrives at theparkingoor is provided to prevent operation of the relays Z and Y andhence the transfer relay TR until the car leaves the parking floor.

It is believed that the invention may lue-betterunderstood by assumingan operation of the apparatus and circuits described.

Operation as high zonecar The rst operation assumed will be that of carsA and B as normal high call reversal cars standing at the lower terminalwith the doors (not shown) closed and with no stop calls registered.Under these conditions, the door relay DR, the up direction preferencerela-y W and the high floor call relav K of car A are in energizedcondition. The door relay DR is energized because all the doors areclosed, thus completing the circuit: L+I, door contacts, DR. L|. Therelay W is energized because the bottom no calls are registered toaffect the circuit 50.

Car A is conditioned as a high zone car because its switch I9 has itscontacts I 9a closed wand its contacts lsb open. Car A will now operateon circuit 50 (Fig. 5) but not on circuit 5I.

With the door closed, the car attendant in car 'A4 closes the car switchCS temporarily to start the car upwardly by energizing the up directionswitch U and the car running relay M through the following circuit:

L+l, cs, csl, WLrI, STU, U, M, 2c, L-l

' The energized relay M closes its contacts MI, M2, and M3 and opens itscontacts M4 to prepare the control system of car A for operation.

The energized up direction switch U closes its contacts UI, U2, U3, U4and U5 and opens its contacts U6 to start the car upwardly. The closingof contacts Ui energizes the brake coil to release the brake l5 (Fig.3). 'Ihe closing of the contacts `Ul and U3 energizes the field windingGF of the generator G by the circuit L-H, U2, GF, U3, Rl, L-|. Theenergizatlon of the field winding GF causes the motor to supply energyto the hoisting motor I4 for operating the drum Il to move carAupwardly.

The closing of the contacts UI energizes the high speed relay V by thecircuit L+I, U4, VTU, El, V, L-l. The energized relay V closes itscontacts Vl thereby shorting the resistor Rl in the circuit of thegenerator iield winding GF, thus increasing the energization of thefield winding GF to cause the motor Il to move the car upwardly at` itsnormal high speed.

It will be assumed now before car A reaches vthe second floor that awaiting down passenger at the sixth floor operates the down call button8D to register a down stop call for that floor. Theeoperation of button5D energizes the relay BDR by the circuit L+3, GD, GDR, 60, 8l, L-3, Theenergized relay BDR closes its contacts GDRI in'its self-holdingcircuit. It also supplies energy 'to the contact segments c6 and B96 tostop the next approaching car which is conditioned to serve it. Theoperated relay GDR also opens its contacts SDRS in thehigh call circuit50 thereby deenergizing the high Hoor call relay K. The deenergizedrelay K opens its contacts KI in the circuit or the high call reversalrelay J.

It will be assumed that car A moves upwardly inthe hatchway on its uptrip with no call registered above it except the down call at the sixthfloor. As it approaches the sixth iloor, its brush the energized contactsegment d6 and thereby energizes the high floor call relay K by thecircuit:

L+5,1DR3, com, (16,34, K,L-5

The energizedv relay K closes its contacts Kl and thereby energizes thehigh call reversing relay J by the circuit:

L+T, J, HI, Kl, W8, L-T

itslinductor relay E comes opposite the up plate UEP for that door andits contacts El are opened,

'opens its contacts Fl, thereby deenergizing the Vcar runningirelay Mand the up direction swtch U. The switch U opens its contacts Ui inthebrake circuit and opens its contacts U2 and U3 in the circuit of thegenerator field winding GF,

thus stopping the car and applying the brake to hold it at the sixthoor.

At the same time the contacts JZ of the energized high call reversingrelay J are open inone of the parallel circuits of the up Ydirectionpreference rel-ay W. Therefore, when the contacts ,M2 of the carrunnin-g relay M are opened for the sixth floor stop. they open theother parallel circuit for the relay W and thus deenergize it. Thedeenergized relay W thereupon closes its back contacts W2 whichenergizes the down preference relay X by the circuit L+ l, U6, W2, X;30B, L-li. The deenergized relay W also opens its "contacts Wl in thecircuit of the up direction switch U and the down preference relay-Xcloses its contacts Xi in the circuit of the down direc-.- tion switchD. This prepares the car for down operation and when the attendantcloses the starting switch CS, the car will start downwardly. Y

Assuming now that the attendant closes the car switch CS he therebyenergizes the down directionswitch D and the car running relay- M by thecircuit L+l, CS, CSI, Xl, F2, STD, D, M, 23, L-l. The energized switch Dand the relay M cause the carto move downwardly to the rst floor wherethe arrival of the car opens the lower limit switch STD to deenergizethe down direction switch D'. Also, as the car reaches the first floor,it opens its bottom terminal switchj30B to deenergize the downpreference` relay X which, in turn, closes its back contacts X2 toenergize the up direction preference relay W to condition .the car forup' direction'operatior.

It is seen by the foregoingdescription how a normal car operates on anup trip t reverse it- `self at the highest down call when there are noup calls above it to be answered.

Operation of stopping andv reversing low zone carV at highest down callin .low cone It will be assumed now, in practicing our invention, thatthe cars A and'B are to be c onditioned for operation as low zone cars.'Ihis is done by moving the switch I9v in car A and the switch BIS incar B ,to the right. The movement of the switch i9 opens its contacts19a and closes i its contacts |917. The opening of the contacts I9adisconnects the up stop brush 32 from the stopping relay S so that car Awill not respond to any registered up call stops. The closing of thecontacts i917 prepares the limit relay Z, the limit circuit 2l and thequota-adjusting relay Y for operation. The control apparatus of car A isnow conditioned to operate it as a lowv zone car. The opening of thecontacts B I'Sa'and the closing of the contacts Bl9b condition thecircuits of car B to cause it to operate asa low zone car. Both cars noware ready for operation on circuits 50 and il. As long as the quotarelay is not 5p erated, the cars operate on circuit 5c but when thequota relay Q is operated, it transfers the first up moving low zone carfrom circuit SIB to circuit 5l. f ,t

It will be assumed now that cars A and B are standing at the lowerterminal ready for operation as low zone cars. ,Under thesecircumstances, with the doors closed, the door relay DR, the updirection relay W and thev high oor call relay K of car A are energized.The same relays for car B are also energized for operation.

It will also be assumed that a waiting down passenger at the secondiioooperates the down call button 2D at the second door, therebyenergizingthe down call registering relay 2DR by the circuit L-i-i, 2l)72DR, BB', 6l, .lL-3. The energized relay 2DR opens its contacts 2DR3 inthe circuit 5i! and its contacts 2DR2 in the circuit 5i and closes itscontacts 2DR! in the circuit oi the quota relay Q. The opening ofcontacts 2DR3 deenergizes the high floor callvrelay K.

vThe energized relay 2DR also closes its contacts ZDRl to establish aself holding circuit and energize the `stopping segments g2 and Bg tostop the next car conditioned to answer it.

It will be assumed also that a Waiting down passenger at the sixthi'loor presses the down call button 6D at that iioor and therebyenergizes the down call storing relay GDR as previously described toenergize its'sgtopping segments gij and BgB to stop the next carconditioned to serve it. i

It will be assumed further that a waiting down passenger at the thirdiioor presses' the down Vbutton 3D for that oor, thereby energizing thedown call registering relay 3DR for the third floor which in turn closesits self holding ccntacts 3DRi and energizes the contact segments g3 andBg3 to stop the next approaching car conditioned to serve it. Theenergizedrelay 3DR also opens its contacts 3DR3 in the circuit 50 and3DR2 in the circuit 5| and closes its contacts 3DR4 in the circuit ofthequota relay Q.

It will be assumed now that the attendant` in car 1A closes temporarilyits switch CS to start the carupwardly. This energizes the up directionswitch U and the oar running relay M to start car A upwardly in themanner previously described.

the circuit'L-i-T, 2l, e2, l0, Z, WIB, Illb, 26, L-1. The operation ofthe relay Z closes its contacts ZI, thereby energizing the quota relay Qbecause the circuit of that relay has been prepared for operation by theregistration of vdown calls at the second and third floors in the lowzone. This quota of two calls will cause the car to stop and reverse atthe third floor in the low zone. /It will be recalled that the quotarelay is adjusted to operate when two down calls are registered in thelow zone with a low zonecar going up in that zone, but of course it maybe designed for operation by any other total of registered calls.

The circuit 'for the quota relay extends through the parallel resistorsR3 and R2 because the contacts 3DR4 and 2DR# in the quota circuit areclosed by reason of the down stored calls at the third iioor and thesecond floor and thence through the coil Q and the contacts YB, BYB andZI' to the supply conductor L-1 The energized relay Q closes itscontacts QI and Q2 in the circuits of the quota-adjusting relays Y andBY for the cars A and B. Relay BY is not energized because its switchB26 is ope'n. The circuit for relay Y extends L+1, QI, Y, Z2, WIII, lsb,2i, L-l. energized relay Y closes its contacts YI and Y4 and opens itscontacts YS.

The closing of the contacts Y4 establishes a self-holding circuit forthe relay Y while the opening of its contacts Y3 deenergizes the quotarelay Q andf'restores it to its normal condition.

The closing of thecontacts/YI energizes the transfer relay TR by thecircuit L-l-S, YI, Wl, TR, L-S. Theenergized rela TR closes itsselfholding contacts TRIS and closes its contacts TRB, TR1, TRS and TRIIleading to the low zone circuit 5I and opens its back contacts TRS, TRB,TRIO and TRIZ leading to the normal call circuit 50 (Fig. 5). Thisoperation transfers Vthe control y of the high iloor call relay K fromthe circuit 50 to L+5, 5|, IDRZ, TR1, d3. 34, K, L-5

Thus, as the energized relay K closes its contacts KI (Fig. 6) itenergizes the high call reversing relay J by the circuit previouslydescribed. Thereupon the relay J closes its self-holding contacts J3 andJ4 and also closes its contacts JI to energize the slow down inductorrelay E and the holding relay G which, in turn, closes its contacts GIto energize the stopping inductor relay F. The relay J also opens itscontacts J2 in the circuit of the relay W. The inductor relays areoperated as the car passes the up slow down plate UEP and stopping plateUFP for the third iloor as previously described in connection rwith thesixth iioor stop, thereby deenergizing the up relay U and the runningrelay M and thus stopping car A at the third iloor in response to theoperation of the reversing relay J.

Car A is now reversed at the third floor because the contacts J2 and M2are opened in the parallel circuits leading to relay W, thusdeenergizing relay W which in turn energizes relay X, as previouslydescribed. i

As car A is stopped and reversed at the third floor in answer to thedown call thereat, its deenergized relay M and its energized relay Xcomplete the following circuit for energizing the coil IDRN tocancelthat down call:

The energized coil SDRN restores the call regisering relay 3DR toitsnormal condition, thereby yopening its front contacts and closing itsback ready for another operation when another low zonecar is moving upin the low zone and a quota f of two down calls exists. When the downcall stop thereat and then moves on down to the lower door again tooperate the quota relay to stop another car.

The deenergized up direction relay W also opens its contacts Wl and WIOthereby deenerwhere the operation of its limit switches restores it toits normal condition for,` up operation as a low zone car.

By the foregoing operation, it is seen that a low zone car will stop andreverse at the highest down call in the low zone when a predeterminednumber of down calls are registered therein before it passes all ofthem.

, Low zone car staying in low zone It will be assumed now that cars Aand B are low zone cars and are standing at the lower landing. It willalso be assumed that a Waiting down passenger at the third floor pressesthe down button 3D at that iloor thereby energizing the down callregistering relay 3DR for the third floor which, in turn, closes itsself-holding contacts SDRIl and energizes the contact segments g3 andBg3 to stop the next approaching car conditioned to serve it. Theenergized relay 3DR. also opens its contacts 3DR2 in the circuit 5I andits contacts 3DR3 in the circuit 50 and closes its contacts 3DR4 in thecircuit of the quota relay Q.

It will be assumed that a waiting down passenger at the sixthiloorpresses the down call 4button 6D at that floor and therebyenergizes the down call storing relay SDR as previously described toenergize its stopping segments g8 and BgB to stop the next carconditioned to serve it. The energized relay SDR also opens its contactsSDRS in the normal circuit 50.

It will be assumed now that the attendant in car A temporarily closesits switch CS and thereby starts the car upwardly by energizing the updirection switch U and the car running relay M as previously described.

As car A leaves the first floor, it closes its cam switch 26. Aspreviously described, this effects energization of the limit relay Zwhen the brush 40 engages the contact segment e2. The energized relay Zcloses its contacts ZI in the circuit of the quota relay Q but inasmuchas only one down/ call has been registered in the low zone, the quotarelay remains unenergized.

It will be assumed now that as the car passes the third door a waitingdown passenger at the second iloor presses the down button 2D at thatfloor, thereby energizing the down call registering relay 2DR for thesecond iloor, which in turn closes its self-holding contacts ZDRI andenergizes the contact segments g2 and B92 to stop the next approachingcar conditioned to serve it. The energized relay 2DR also opens itscontacts 2DR2 in the circuit 5I and its contacts 2DR3 in the circuit 50and closes its contacts ZDRI in the circuit of the quota relay Q. Hencewith the down call at the third floor and the down call at the secondoor, the quota of two down calls is created in the lowzone while car Ais passing the higher one at the third iloor. Al.. though it is .toolate to stop car A at. the third oor, it will remain in the low zone and`will be stopped and reversed'at the next floor to answer 3DR4 and 2DR4,in parallel through resistors R3 and R2. and thence through Q, Y3, BY3,ZI, L'|.

The energized relay Q closes its contacts QI and Q2 in the circuits ofthe quota adjusting relays Y and BY for the cars A and B and relay Y isenergized by the circuit previously described.

The energized relay Y closes its contacts YI and Y4 and opens itscontacts Y3. The closing of the contacts YA establishes a sell-holdingcircuit for the relay Y and the opening of its .contacts Y3 restores thequota relay Q to its normal condition.

The closing of the contacts YI energizes the transfer relay TR by thecircuit previously described. The .energized relay TR closes itsselfholding contacts TRI3 and its contacts TRS, TR1, TRS and TRIIleading to the circuit I and opens its contacts TRS, TRB, TRIO and TRI2between the d contacts and the normal circuit. This operation transfersthe control of the high floor call relay K of car A from the circuit`5|] to the circuit 5l, so that the circuit 5I will cause car A to bestopped and reversed in the low zone Abecause the quota has 'been lledand the quota relay Q has been-operated.

As car A continues its approach to the fourth floor, its brush 34engages the contact segment d4 connected to. the upper energized portionof circuit 5I and thereby energizes the relay K now transferred to thiscircuit, as previously described.

As the energized relay K closes its contacts KI, it energizes the highcall reversing relay J by the circuit previously described. Thereuponthe relay J closes its contacts J I to energize the slow down inductorrelay E and the holding relay G which, in turn, energizes the stoppinginductor relay F. The inductor relays operate as the car passes the upslow down plate UEP and the stopping plate UFP for the fourth floor, aspreviously described' in connection with the sixth floor stop, therebystopping car Aat the fourth floor in response to the operation of thequota device. y

The energized relay J also opens its contacts J2 in the parallel circuitfor the relay W, therelby reversing the car as previously described.When the car stops, the attendant close sthe car switch CS temporarilyto restart the car. As the car has been reversed, it starts downwardlyand is stopped at the third floor by the down call registered thereat.As soon as the waiting passenger at the third oor enters the car, theattendant closes the switch CS tem porarily and the car startsdownwardly, stopping at the second oor for the down call thereat andthen going down to^ the lower floor where the operation of its limit'switches restores it to normal condition for the next up trip.

It will also be observed that, although a down rcall was registered atthe sixth floor in the upper zone,'that registered call did notaffectthe reversal of the car in the low zone. The down call at thesixth floor did: not aiect the operation because the quota lrelayoperated the relay Y which operated the transfer relay TR to transfercar A from the normal circuit 50 (which included the sixth oor callrelay contacts BDRS) to the low zone circuit 5I which did not includeany contacts ofthe sixth oor call relay GDR.

Operation of low Vzone car into upper zone and answer down calls in theupper zone, the following assumed operation is given.

It will be assumed that down calls are registei-ed at the sixth oor, thefifth oor and the second floor. l

The operation of the button 6D for the down call at the sixth iloorenergizes the relay BDR by the circuit previously described. Theenergized relay BDR closes its contacts BDRI to cornplete itsself-holding circuit while it energizes contact segment Q6 and alsoopens its contacts bDR in normal circuit 50.

The operation of the button 5D for the down call at the fth floorenergiZes the relay 5DR by the circuit L-I-3, 5D, EDR, 60, El, L-3. Theenergized relay SDR closes its self-holding contacts 5DRI and energizesthe contact segments g5 and B915 and opens its contacts 5DR4 in thenormal circuit 50.'

The pressing of the down button 2D at the second noor energizes the callregistering relay 2DR, as previously described ior energizing thecontact segment g2v and for opening the circuits and 5l and for closingone circuit through resistor R2 t0 the quota relay Q.

It will` be assumed now that both cars A and B are at the lower terminaland that they have been conditioned by operation of their switches I9and Bi@ to operate as low zone cars. With car A at the rst oor, its updirection preference relay W is energized and, assuming that its door isclosed and that the attendant closes the car switch CS, then the carstarts on an up trip as previously described. Inasrnuch as only one downcall (second oor) is now registered in the low zone, the quota relay Qis not operated.

As car A passes out of the low zone by leaving the fourth floor andapproaching the fifth floor, its brush 40 leaves the contact segment e4,thus deenergizing the relay Z and preventing car A from being given aquota after it runs above the low zone.

vAs car A moves on upwardly, its brush 34 engages the energized contactsegment d6 and thereby energizes relay K to cause the stopping andreversal of car A at the highest down call in the upper zone which is atthe sixth iioor, there being a down call at the fth floor which the lowzone car did not now answer because the contacts SDRE were open in thecircuit 50. The circuit for 4the high floor call relay K extends L+5,maa, sURz, de, a4, K, L-s

The energized relay K. closes its contacts KI (Fig. 6) and therebyenergizes the high call .reversing relay J of car A by the circuitprevicar running relay M has opened its contacts M2 in the parallelcircuit for up Adirection preference relay W, thatr relay is deenergizedand thereupon closes its back contacts W2 in the circuit forlthe downdirection preference relay X. The

deenergized relay W opens its contacts WI in the circuit of the updirection switch U, and the down direction preference relay X closes itscontacts XI in the circuit of the down direction switch D (Fig. 3) sothat the next closing operation of the v car switch ES will cause car Ato move wardly. y

It will be assumed now that Ithe attendant temporarily closes the carswitch CS and that car A moves downwardly. As car A approaches the fifthfloor, its brush d2 engages the energized down contact segment g5 forthe iifth oor andy thereby completes a circuit for energizing thestopping relay S which closes its contacts Si to energize the inductorrelays to eect the stopping of the car, as previously described. Car Ais now stopped at ,the iifth floor and takes on the waiting passengers.

It will be assumed now that car A has taken on al1 the passengers it cancarry and that the car attendant presses the by-pass button 2l therebyopening its contacts 2id to prevent energlzation of the stopping relayS. As the car attendant closes the car switch CS temporarily, car Astarts down to the lower terminal and ley-passes the down call at thesecond door, because its stopping relays has been rendered ineffectiveby th operation of the by-pass button 2l.

By the operation just assumed, it is seen that a low zone car whichpasses out of the low zone because of the small number of down callsregistered in -that zone at that time, will be stopped and reversed atthe highest down call in the upper zone.

Any low zone car leaving the low zone without quota will operate on thehigh call reversal circuit 50, because its transfer relay TR is notenergized. However, if the highest registered call.

above it is an up call, the low zone car will not stop there but willgoone floor beyond' it and then stop and reverse, answering any downcalls it meets on its down operation.' It will not answer the up callwhile moving up, because its up brush 32 is disconnected by the opencontacts l9a of the zone selecting switch I9.

It also will be apparent from the foregoing description and assumedoperations that we have provided a, exible control system whereby partof the cars in a bank of elevators can be operated as high call reversalcars and the other part of the cars can be operated as low zone cars,but that the low zone cars will leave the low zone and move into thehigh zone if they do not have at least a predetermined number of downcalls to answer in the low zone. This is a. novel result as it makes thesystem very flexible and does not limit the cars to only certain floorsfor operation but causes them to so act normally that the one groupserves the upper floors and the other group serves the lower floors butthat either group may help out the other group and not be limited onlyto one zone of operation.

Although we have illustrated and described only one specific embodimentof our invention, it is to be understood that modiiications thereof andchanges therein may be made without departing from the spirit and scopeo the invention.

We claim as our invention:

1. In an elevator system, a plurality of cars for serving a pluralityrof floors, means dividing the floors into zones including a low zoneand a high zone, means for conditioning any selected car as a'low zonecar, an operating means for each car, an up call device and a down calldevice at each door and common to all the cars; for causing theoperating means of the cars to stop the cars thereat when they are incondition to make such stops, and means responsive to a predeterminednumber of down call devices in the low zone down? navarra being inoperated. condition for controliing the none dividing means to cause theoperating means of an up moving low zone car in the low zone to stop itand reverse it at the highest operated down call device in the low zone.i

2. In an elevator system, a plurality of cars for serving a plurality ofiioors, means dividing the iioors into zones including a low vzone and ahigh zone, means for conditioning any selected car as a low zone car, anoperating means foreach car, an up call device and a down call device ateach iloor and common to all the cars, for causing the operating meansof the cars to stop the cars thereat when they are in condition to makesuch stops, a quota device common. to all the cars, a plurality ofcircuits responsive to a predetermined number of down call devices beingin operated condition for operating the quota device, and meansresponsive to operation of the quota device for controlling the zonedividing means to cause the operating means of an up moving low zone carin the low zone to stop it and reverse it at the highest operated downeall device in the `low zone.

3. An elevator system comprising a car serving a plurality of oorsdivided into zones including a low zone and a high zone, an operatingmeans for the car, an up call device and a down call device'at eachfloor for causing the operating means of the car to stop it thereat whenit is in condition to make such stop, a normal call-above circuit forcausing the car to stop at the highest call, a special call-abovecircuit for causing the car to stop at the highest call in the low zone,means responsive to operation of the call devices for controlling thenormal call circuit and the special call circuit, a quota device, meansresponsive to a predetermined number of down call devices in the low'zone being in operated condition for operating the quota device, andmeans responsive to operation of the quota device for disconnecting thenormal call above circuit and connecting the special call above circuitto cause the car when running upwardly in the low zone to stop andreverse at the highest down call-device in operated condition in the lowzone.

ll'. In an elevator system, a plurality of cars for serving a pluralityof iioors, means for dividing the floors into groups including an uppergroup and a lower group, a call device for each direction of operationfor each floor operable to register stop calls for the cars at thatfloor, means Afor operating the cars, a reversing means for each caroperable on up motion of that car for causing it to normally stop at thehighest iioor for which a down call device is in operated condition whenthere is no other call above it, and means responsive to a predeterminednumber of down call devices for floors in said lower group-being inoperated condition for controlling the dividing means to cause thereversing means of one of the cars on its up motion in the lower ,groupto stop it at the highest floor in said lowergroup for which a down calldevice is lin operated condition and to cause further movement of saidcar to be in the down direction. ,I

5. An elevator system comprising a plurality of cars for serving aplurality of oors including an upper terminaly iioor, a lower terminalfloor 'and intermediate floors; an operating means ior each car, anup-call device and a down call device for each of the iioorsintermediate the terminal floors for causing the operating means of thecars to stop them thereat when they arein condition to make such stops,means for causing the up moving cars to stop and. reverse theirdirection of operation at the highest operated call device when it is adown call device, means for dividing the floors into zone groupsincluding a low zone group and a high zone group, means for conditioningany selected car or cars for special service for the low zone group offloors, and a quota means responsive to a predetermined number of downcall devices in the low zone group of floors being in operated conditionfor controlling the reversing means to cause the operating means of anup moving low zone car in the low zone to stop and reverse it in thatzone.

6. An elevator system comprising a plurality of cars for serving aplurality of floors intermediate i an upper terminal floor and a lowerterminal iloor, an operating means for each car, an up call device and adown call device for each intermediate floor for causing the operatingmeans of the cars to stop them thereat when they are in condition tomake such stops, means for causing the up moving cars to stop andreverse their direction of operation at the highest operated call devicewhen it is a down call device, means for dividing the floors into groupsincluding a low zone group and a high zone group, means for conditioningany selected car or cars for special service in the low zone group ofoors, a quota means common to all the cars and responsive to apredetermined number of down call devices in the low zone group offloors being in operated condition for controlling the .reversing meansto cause the operating means of an up moving low zone car in the lowZone'to stop and reverse it at the highest operated down call device inthe low zone group of oors, and means responsive to operationofthe'stopping and reversing means of said up moving car for returningthe quota means to normal condition and requiring the operation of anadditional down call device in the low zone to cause stopping andreversal of the next up moving low zone car which enters the low zoneafter the quota means is returned t'o normal condition.`

7. An elevator control system for a plurality of cars for serving aplurality of floors, comprising means for connecting the c ontrol systemto divide the floors into groups including an upper group andwawlowergroup, a means for operating each car through all-doors,V an up calldevice and a down call device at each oor for causing the operatingmeans of the cars to stop the car-s thereat when they are in conditionto make such stops, and means responsive to a predetermined number ofdown call devices for the lower group of iioors being in operatedcondition for controlling the zone dividing means to cause an up movingcar in the lower group to remain in that group of floors.

l8. An elevator system comprising a car serving n a plurality of floorsdivided into zones including a low zoneand a high zone, an operatingmeans for the car, a call device at each iiocr for causing the operatingmeans of the car to stop it thereat when it is in condition to make suchstop, a normal call-above circuit for both zones, a special call-abovecircuit for the low zone, means responsive to operation of the calldevices for con'- trolling thenormal call circuit and the special callcircuit, car reversing means responsive to operation of the normalcircuit for stopping and reversing the car at .the'highest call, and aquota device responsive to 'a predetermined number of call devices inthe low zone being in operated condition for conditioning the call abovecircuits and the reversing means to cause the car while in the low zoneto 'stop and reverse in thatA zone.

9. An elevator system comprising a car serving a plurality of floorsdivided into zones including a low zone and a high zone, an operatingmeans for the car, a call device at each iioor for causing the operatingmeans of the car to stop it thereat when it is in condition to make suchstop, a normal call-above circuit for both Zones, a special call-abovecircuit for the low zone, meansresponsive to operation of the calldevices for controlling the normal callv circuit and the special callcircuit, car reversing means responsive to operation of the normalcircuit for stopping and reversing the car at the highest call, a quotadevice responsive to a predetermined number of call devices inthe lowzone being in operated condition for conditioning the call abovecircuits and the reversing means to cause the car while in the low zoneto stop and reverse at the highest call in that zone, means responsiveto the stopping of the car at a call in the low zone for cancelling thecall thereat, and means responsive to the cancellation of the callfordeenergizing the quota device.

10. An elevator system comprising a plurality of cars serving aplurality of floors divided into zones including a low zone and a highzone, an operating means for each car, an up call device and a down calldevice at each floor for causing the operating means of any car to stopit thereat when it is in condition to make such stop, call# abovecircuits for the zones, means responsive to operation of the calldevices for controlling the call-above circuits, car reversing means foreach car responsive to operation oi the circuits for stopping andreversing that car at the highest call, a quota device common to al1 thecars, means responsive to a predetermined number of down call devices inthe low zone being in operated condition for operating the quota device,and means responsive to operationyof the quota device for conditioningthe call-above circuits and the reversing means of an upI moving car inthe low zone to stop and reverse in that, zone.

l1. An elevator system comprising a plurality of cars serving aplurality of oors divided into zones including a low zone and a highZone, an operating means for each car, an up call device and a down calldevice at each door for causing the operating means of any car to stopit thereat when it is in condition to make such stcp, callabcve circuitsfor the zones, means responsive to operation of the call devices forcontrolling the call-above circuits, car reversing means for each carresponsive to operation ,of the circuits for stopping and reversing thatcar at the highest call, a quota device common to all the cars, meansresponsive to a predetermined number of down call devices in the lowzone being in operated condition for operating the quota device, meansresponsive tcoperation of the quota device for conditioning the callabove circuits and the reversing means of an up moving'car in the lowzone to stop and reverse it to answer the highest operated down calldevice in that zone, and means responsive to that car answering thehighest operated call device in the low zone for rendering the quotadevice inelective to stop the next car which enters the low zone aftersaid highest call device is answered until -at least one additional downcall devicein the low zone is operated.

12. An elevator system comprising a plurality of cars serving a.plurality of oors divided vinto zones including a low zone and a highzone, an

